Systems and methods for responding to theft of sensor enclosures

ABSTRACT

Systems and methods are provided for responding to theft of a sensor enclosure of an autonomous vehicle. Theft of the sensor enclosure can be detected using at least one piezoelectric sensor. An electrical signal to the at least one piezoelectric sensor can be generated. The at least one piezoelectric sensor can be caused to emit a sound based on the electric signal.

FIELD OF THE INVENTION

This disclosure relates to autonomous vehicles. More particularly, thisdisclosure relates to responding to theft of sensor enclosures.

BACKGROUND

In general, an autonomous vehicle (e.g., a driverless vehicle, asemi-autonomous vehicle, etc.) can have myriad sensors onboard theautonomous vehicle. For example, the myriad sensors can include lightdetection and ranging sensors (LiDARs), radars, cameras, etc. The myriadsensors can play a central role in functioning of the autonomousvehicle. For example, a LiDAR can be utilized to detect and identifyobjects (e.g., other vehicles, road signs, pedestrians, buildings, etc.)in a surrounding. The LiDAR can also be utilized to determine relativedistances of the objects to the LiDAR in the surrounding. As anotherexample, radars can be utilized to aid with collision avoidance,adaptive cruise control, blind side detection, etc. As yet anotherexample, cameras can be utilized to recognize, interpret, and/or analyzecontents or visual cues of objects. Data collected from these sensorscan then be processed and used, as inputs, to make driving decisions. Ingeneral, sensors onboard an autonomous vehicle are expensive oreconomically costly, and thus, may be subject to theft.

SUMMARY

Various embodiments of the present disclosure can include systems andmethods configured for responding to theft of a sensor enclosure of anautonomous vehicle. Theft of the sensor enclosure can be detected usingat least one piezoelectric sensor. An electrical signal to the at leastone piezoelectric sensor can be generated. The at least onepiezoelectric sensor can be caused to emit a sound based on the electricsignal.

In some embodiments, the at least one piezoelectric sensor can comprisea piezoelectric disk adhered to a diaphragm. The piezoelectric disk cancomprise one of a crystal material or a ceramic material. The diaphragmcan comprise metallic alloy.

In some embodiments, the crystal material can comprise at least one ofquartz, langasite, gallium orthophosphate, lithium niobate, or lithiumtantalate.

In some embodiments, the ceramic material can comprise at least one ofbarium titanate, lead zirconate titanate, potassium niobate, sodiumtungstate, zinc oxide, sodium potassium niobate, bismuth ferrite, sodiumniobate, barium titanate, bismuth titanate, or sodium bismuth titanate.

In some embodiments, the metallic alloy can comprise at least one ofbrass or nickel alloy.

In some embodiments, the sound emitted from the at least onepiezoelectric sensor can be amplified based on resonance.

In some embodiments, a frequency of the sound emitted from the at leastone piezoelectric sensor can be tuned to be near a resonant frequencyassociated with the at least one piezoelectric sensor. The frequency ofthe sound emitted from the at least one piezoelectric sensor can betuned by at least one of varying a size of the diaphragm or varying afrequency at which the electrical signal changes its polarity.

In some embodiments, the electrical signal can be an alternating voltagesignal.

In some embodiments, the alternating voltage signal can cause thepiezoelectric disk to elongate or contract in response. The elongationor the contraction of the piezoelectric disk can cause the diaphragm tomove in a back and forth motion causing sound waves audible as thesound.

In some embodiments, the sound emitted from the at least onepiezoelectric sensor can be amplified by coupling the at least onepiezoelectric sensor to an acoustical cone.

These and other features of the systems, methods, and non-transitorycomputer readable media disclosed herein, as well as the methods ofoperation and functions of the related elements of structure and thecombination of parts and economies of manufacture, will become moreapparent upon consideration of the following description and theappended claims with reference to the accompanying drawings, all ofwhich form a part of this specification, wherein like reference numeralsdesignate corresponding parts in the various figures. It is to beexpressly understood, however, that the drawings are for purposes ofillustration and description only and are not intended as a definitionof the limits of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

Certain features of various embodiments of the present technology areset forth with particularity in the appended claims. A betterunderstanding of the features and advantages of the technology will beobtained by reference to the following detailed description that setsforth illustrative embodiments, in which the principles of the inventionare utilized, and the accompanying drawings of which:

FIG. 1A illustrates an example autonomous vehicle, according to anembodiment of the present disclosure.

FIG. 1B illustrates an another example autonomous vehicle, according toan embodiment of the present disclosure.

FIG. 2 illustrates an example enclosure detection system, according toan embodiment of the present disclosure.

FIG. 3A illustrates a cross-sectional view of an example enclosuredetection system, according to an embodiment of the present disclosure.

FIG. 3B illustrates an example of an enclosure for a sensor systemaccording to an embodiment of the present disclosure.

FIG. 4A illustrates a torque measurement scenario, according to anembodiment of the present disclosure.

FIG. 4B illustrates a theft detection scenario, according to anembodiment of the present disclosure.

FIG. 4C illustrates a theft response scenario, according to anembodiment of the present disclosure.

FIG. 4D illustrates an x-y plot for amplifying a sound emitted from apiezoelectric sensor, according to an embodiment of the presentdisclosure.

FIG. 5 illustrates an example method, according to an embodiment of thepresent disclosure.

FIG. 6 illustrates a block diagram of a computer system.

The figures depict various embodiments of the disclosed technology forpurposes of illustration only, wherein the figures use like referencenumerals to identify like elements. One skilled in the art will readilyrecognize from the following discussion that alternative embodiments ofthe structures and methods illustrated in the figures can be employedwithout departing from the principles of the disclosed technologydescribed herein.

DETAILED DESCRIPTION

In the following description, certain specific details are set forth inorder to provide a thorough understanding of various embodiments of theinvention. However, one skilled in the art will understand that theinvention may be practiced without these details. Moreover, whilevarious embodiments of the invention are disclosed herein, manyadaptations and modifications may be made within the scope of theinvention in accordance with the common general knowledge of thoseskilled in this art. Such modifications include the substitution ofknown equivalents for any aspect of the invention in order to achievethe same result in substantially the same way.

Unless the context requires otherwise, throughout the presentspecification and claims, the word “comprise” and variations thereof,such as, “comprises” and “comprising” are to be construed in an open,inclusive sense, that is as “including, but not limited to.” Recitationof numeric ranges of values throughout the specification is intended toserve as a shorthand notation of referring individually to each separatevalue falling within the range inclusive of the values defining therange, and each separate value is incorporated in the specification asit were individually recited herein. Additionally, the singular forms“a,” “an” and “the” include plural referents unless the context clearlydictates otherwise. The phrases “at least one of,” “at least oneselected from the group of,” or “at least one selected from the groupconsisting of,” and the like are to be interpreted in the disjunctive(e.g., not to be interpreted as at least one of A and at least one ofB).

Reference throughout this specification to “one embodiment” or “anembodiment” means that a particular feature, structure or characteristicdescribed in connection with the embodiment is included in at least oneembodiment of the present invention. Thus, the appearances of thephrases “in one embodiment” or “in an embodiment” in various placesthroughout this specification are not necessarily all referring to thesame embodiment, but may be in some instances. Furthermore, theparticular features, structures, or characteristics may be combined inany suitable manner in one or more embodiments.

In general, an autonomous vehicle (e.g., a driverless vehicle, asemi-autonomous vehicle, etc.) can have myriad sensors onboard theautonomous vehicle. The myriad sensors can include light detection andranging sensors (LiDARs), radars, cameras, global positioning systems(GPS), sonars, inertial measurement units (IMUs), accelerometers,gyroscopes, magnetometers, far infrared sensors (FIR), etc. The myriadsensors can play a central role in functioning of the autonomousvehicle. For example, a LiDAR can be utilized to detect and identifyobjects (e.g., other vehicles, road signs, pedestrians, buildings, etc.)in a surrounding. The LiDAR can also be utilized to determine relativedistances of the objects to the LiDAR in the surrounding. As anotherexample, radars can be utilized to aid with collision avoidance,adaptive cruise control, blind side detection, assisted parking, etc. Asyet another example, cameras can be utilized to recognize, interpret,and/or analyze contents or visual cues of the objects. Cameras and otheroptical sensors can capture image data using charge coupled devices(CCDs), complementary metal oxide semiconductors (CMOS), or similarelements. An IMU may detect abnormal occurrences such as a bump orpothole in a road. Data collected from these sensors can then beprocessed and used, as inputs, to make driving decisions (e.g.,acceleration, deceleration, direction change, etc.). For example, datafrom these sensors may be further processed into an image histogram of agraphical representation of tonal distribution in an image captured bythe one or more sensors.

In general, sensors onboard an autonomous vehicle are highly calibratedor aligned. This means placements of sensors with respect to theautonomous vehicle need to be known within a high degree of confidence.Any deviation from these sensor placements can lead to unreliable data.For example, a LiDAR relies on speed of light and position of laserbeams to determine relative distances and locations of objects in athree dimensional surrounding. Data collected by the LiDAR is highlydependent (or calibrated) to a specific location to which the LiDAR isplaced. Depending on where the LiDAR is located, the distances and thelocations of the objects, as determined by the LiDAR, can vary. Forinstance, time it takes for a reflected light to reach a LiDAR locatedin the front of an autonomous vehicle will be different from time ittakes for the same reflected light to reach a LiDAR located in the backof the autonomous vehicle. This slight time difference, in some cases,can make the distance and the location determinations not reliable foruse in guiding the autonomous vehicle. To minimize number of sensoralignments, sensors, such as LiDARs and cameras, can be encased in anenclosure. The enclosure allows the sensors to be removed from oneautonomous vehicle and installed to another autonomous vehicle with easeand without numerous alignments. For example, instead of removingsensors from one vehicle, and installing and aligning the sensors toanother vehicle individually in multiple acts, an enclosure containingvarious sensors can be removed from the one vehicle, and the enclosurecan be installed and aligned to the another vehicle in a single act,thus, simplifying sensor alignments. The enclosure can be affixed to afixture on the roof (e.g., the top) of an autonomous vehicle usingmechanical coupling devices (e.g., screws, nuts and bolts, rivets,etc.). These mechanical coupling devices can be tightened to a specifictorque value to ensure that the enclosure is properly secured onto thefixture, and thus the autonomous vehicle. One drawback of encasingsensors in an enclosure is ease of theft. Sensors encased by theenclosure generally tend to be expensive or economically costly. Thefact that the enclosure is affixed externally to an autonomous vehiclemay subject the enclosure to potential theft. For example, when leftunattended, a person can use various means to forcibly remove anenclosure containing various sensors of the autonomous vehicle. Underconventional approaches, security personnel can be deployed to patrol apremise on which autonomous vehicles are stationed. In some cases,fencing can be erected around the premise to provide additionalsafeguard against theft. However, such approaches to safeguard sensorsof an autonomous vehicle from theft is cumbersome, costly, andinefficient. Accordingly, conventional approaches to prevent theft arenot ideal.

The disclosed technology alleviates this and other problems under theconventional approaches. In various embodiments, the disclosedtechnology can utilize one or more piezoelectric sensors to measuretorque values associated with one or more mechanical coupling devices(e.g., screws, nuts and bolts, rivets, fasteners, etc.) used to securean enclosure to a fixture of an autonomous vehicle. The enclosure can beplaced onto the fixture. The enclosure can be translated along an axisof the fixture. For example, the enclosure can move or glide forward orbackward on the fixture along the body of the autonomous vehicle. Insome embodiments, the enclosure can have one or more mounting pointsthrough which the one or more mechanical coupling devices are used tosecure the enclosure. Each mounting point can be associated with apiezoelectric sensor. For example, an enclosure can have four mountingpoints that are used to secure the enclosure to a fixture. In thisexample, there can be a piezoelectric sensor at or near each mountingpoint on the enclosure. In general, a piezoelectric sensor can measurepressure between any two surfaces. For example, a piezoelectric sensordisposed between an enclosure and a fixture can measure pressure exertedby the enclosure to the fixture. Once the enclosure is translated to afinal alignment location on the fixture, initial pressure measurementsfrom the one or more piezoelectric sensors of the enclosure can be“zeroed” or set to an initial value. As the one or more mechanicalcoupling devices are tightened to secure the enclosure to the fixture,pressure exerted by the enclosure to the fixture increases. Thispressure can be measured by the one or more piezoelectric sensors andconverted into corresponding torque values associated with the one ormore mechanical coupling devices. In some embodiments, once the one ormore mechanical coupling devices are tightened to a specific torquevalue as indicated by the pressure measurement, an audio or visual cuecan be emitted to signify that the one or more mechanical couplingdevices are at their proper torque values. In some embodiments, the oneor more piezoelectric can be utilized for enclosure theft detection anddeterrence. Various embodiments are discussed herein in greater detail.

FIG. 1A illustrates an example autonomous vehicle 100, according to anembodiment of the present disclosure. An autonomous vehicle 100generally refers to a category of vehicles that are capable of sensingand driving in a surrounding by itself. The autonomous vehicle 100 caninclude myriad sensors (e.g., LiDARs, radars, cameras, etc.) to detectand identify objects in the surrounding. Such objects may include, butnot limited to, pedestrians, road signs, traffic lights, and/or othervehicles, for example. The autonomous vehicle 100 can also includemyriad actuators to propel and navigate the autonomous vehicle 100 inthe surrounding. Such actuators may include, for example, any suitableelectro-mechanical devices or systems to control a throttle response, abraking action, a steering action, etc. In some embodiments, theautonomous vehicle 100 can recognize, interpret, and analyze road signs(e.g., speed limit, school zone, construction zone, etc.) and trafficlights (e.g., red light, yellow light, green light, flashing red light,etc.). For example, the autonomous vehicle 100 can adjust vehicle speedbased on speed limit signs posted on roadways. In some embodiments, theautonomous vehicle 100 can determine and adjust speed at which theautonomous vehicle 100 is traveling in relation to other objects in thesurrounding. For example, the autonomous vehicle 100 can maintain aconstant, safe distance from a vehicle ahead (e.g., adaptive cruisecontrol). In this example, the autonomous vehicle 100 maintains thissafe distance by constantly adjusting its vehicle speed to that of thevehicle ahead.

In various embodiments, the autonomous vehicle 100 may navigate throughroads, streets, and/or terrain with limited or no human input. The word“vehicle” or “vehicles” as used in this paper includes vehicles thattravel on ground (e.g., cars, trucks, bus, etc.), but may also includevehicles that travel in air (e.g., drones, airplanes, helicopters,etc.), vehicles that travel on water (e.g., boats, submarines, etc.).Further, “vehicle” or “vehicles” discussed in this paper may or may notaccommodate one or more passengers therein. Moreover, phrases“autonomous vehicles,” “driverless vehicles,” or any other vehicles thatdo not require active human involvement can be used interchangeably.

In general, the autonomous vehicle 100 can effectuate any control toitself that a human driver can on a conventional vehicle. For example,the autonomous vehicle 100 can accelerate, brake, turn left or right, ordrive in a reverse direction just as a human driver can on theconventional vehicle. The autonomous vehicle 100 can also senseenvironmental conditions, gauge spatial relationships (e.g., distancesbetween objects and itself), detect and analyze road signs just as thehuman driver. Moreover, the autonomous vehicle 100 can perform morecomplex operations, such as parallel parking, parking in a crowdedparking lot, collision avoidance, etc., without any human input.

In various embodiments, the autonomous vehicle 100 may include one ormore sensors. As used herein, the one or more sensors may include aLiDAR 102, radars 104, cameras 106, GPSs, sonars, ultrasonic, IMUS,accelerometers, gyroscopes, magnetometers, FIRs, and/or the like. Theone or more sensors allow the autonomous vehicle 100 to sense asurrounding around the autonomous vehicle 100. For example, the LiDARs102 can be configured to generate a three-dimensional map of thesurrounding. The LiDARs 102 can also be configured to detect objects inthe surrounding. As another example, the radars 104 can be configured todetermine distances and speeds of objects around the autonomous vehicle100. As yet another example, the cameras 106 can be configured tocapture and process image data to detect and identify objects, such asroad signs, as well as analyzing content of the objects, such as speedlimit posted on the road signs.

In the example of FIG. 1A, the autonomous vehicle 100 is shown with theLiDAR 102 mounted to a roof or a top of the autonomous vehicle 100. TheLiDAR 102 can be configured to generate three dimensional maps anddetect objects in the surrounding. In the example of FIG. 1A, theautonomous vehicle 100 is shown with four radars 104. Two radars aredirected to the front-side and the back-side of the autonomous vehicle100, and two radars are directed to the right-side and the left-side ofthe autonomous vehicle 100. In some embodiments, the front-side and theback-side radars can be configured for adaptive cruise control and/oraccident avoidance. For example, the front-side radar can be used by theautonomous vehicle 100 to maintain a safe distance from a vehicle aheadof the autonomous vehicle 100. As another example, if the vehicle aheadexperiences a sudden reduction in speed, the autonomous vehicle 100 candetect this sudden change in motion, using the front-side radar, andadjust its vehicle speed accordingly. In some embodiments, theright-side and the left-side radars can be configured for blind-spotdetection. In the example of FIG. 1A, the autonomous vehicle 100 isshown with six cameras 106. Two cameras are directed to the front-sideof the autonomous vehicle 100, two cameras are directed to the back-sideof the autonomous vehicle 100, and two cameras are directed to theright-side and the left-side of the autonomous vehicle 100. In someembodiments, the front-side and the back-side cameras can be configuredto detect, identify, and determine objects, such as cars, pedestrian,road signs, in the front and the back of the autonomous vehicle 100. Forexample, the front-side cameras can be utilized by the autonomousvehicle 100 to identify and determine speed limits. In some embodiments,the right-side and the left-side cameras can be configured to detectobjects, such as lane markers. For example, side cameras can be used bythe autonomous vehicle 100 to ensure that the autonomous vehicle 100drives within its lane.

FIG. 1B illustrates an another example autonomous vehicle 120, accordingto an embodiment of the present disclosure. In the example of FIG. 1B,the autonomous vehicle 120 is shown with an enclosure 122 and fourradars 124. The enclosure 122 is mounted onto a fixture 126. In someembodiments, the fixture 126 can be a roof rack or a custom rack fittedto the autonomous vehicle 120. The enclosure 122, when mounted onto thefixture 126, can translate along a linear axis 128. For example, oncemounted onto the fixture 126, the enclosure 122 can be adjusted to movein a forward or a backward direction with respect to the autonomousvehicle 120, along the linear axis 128 of the fixture 126. In someembodiments, the enclosure 122 can be moved along a nonlinear axis. Inone embodiments, the enclosure 122 can include a LiDAR, a plurality ofradars and cameras, and their associated electronics. In anotherembodiment, the enclosure 122 can include a LiDAR, a plurality ofcameras, and their associated electronics. Many variations are possible.The enclosure 122 allows sensors to be packaged compactly or tightly andto be moved from one vehicle to another easily. In various embodiments,the enclosure 122 can be made from any materials that are transparent toelectromagnetic waves emitted by or receptive to the sensors encased inthe enclosure 122. In various embodiments, an outer cover of theenclosure 122 can be made from tempered glass, plexiglass, chemicallystrengthened glass, and the likes.

In some embodiments, the enclosure 122 can include one or morepiezoelectric sensors. The one or more piezoelectric sensors can measurepressure (or strain) between any two surfaces. A piezoelectric sensor isa type of sensor that converts pressure into electrical signal. Theelectrical signal can be digitized and analyzed by a computing system todetermine torque values corresponding to the pressure between twosurfaces. In some embodiments, a piezoelectric sensor can be disposed,in-line, between the enclosure 122 and the fixture 126, or beneath theenclosure 122. In such embodiments, one side of the piezoelectric sensormakes a contact with the enclosure 122 and the other side of thepiezoelectric sensor makes a contact with the fixture 126. In someembodiments, a plurality of piezoelectric sensors can be disposed atvarious mounting points of the enclosure 122. For example, the enclosure122 may have four mounting points through which the enclosure 122 can besecured, with mechanical coupling devices (e.g., screws, nuts and bolts,rivets, fasteners, etc.), to the fixture 126. In this example, apiezoelectric sensor can be disposed at each mounting point of theenclosure 122 to determine torque value exerted by the mechanicalcoupling device at each mounting point.

FIG. 2 illustrates an example enclosure detection system 200, accordingto an embodiment of the present disclosure. The example enclosuredetection system 200 can include an enclosure detection engine 202 thatcan further include one or more processors and memory. The processors,in conjunction with the memory, can be configured to perform variousoperations associated with the enclosure detection engine 202. Forexample, the processors and memory can determine torque exerted by amechanical coupling device to secure an enclosure to a fixture ofautonomous vehicle. The torque exerted can be determined based onpressure as measured by a piezoelectric sensor disposed between theenclosure and the fixture. As shown in FIG. 2, in some embodiments, theenclosure detection engine 202 can include a measurement initializationengine 204, a torque conversion engine 206, a notification engine 208,and a theft response engine 210. The measurement initialization engine204, the torque conversion engine 206, the notification engine 208, andthe theft response engine 210 will be discussed in further detail below.

In some embodiments, the enclosure detection system 200 can additionallyinclude at least one data store 220 that is accessible to the enclosuredetermination engine 202. In some embodiments, the data store 220 can beconfigured to store parameters, data, configuration files, ormachine-readable codes of the measurement initialization engine 204, thetorque conversion engine 206, the notification engine 206, and the theftresponse engine 210.

In general, the enclosure detection engine 202 can determine a torquevalue associated with using a mechanical coupling device to secure anenclosure to a fixture of an autonomous vehicle. The enclosure detectionengine 202 can determine the torque value based on pressure measured bya piezoelectric sensor disposed between the enclosure and the fixture.As discussed above, a piezoelectric sensor can measure pressure betweentwo surfaces and can convert this pressure into electrical signal thatcan be further processed. To do so, an initial pressure measurement fromthe piezoelectric sensor is “zeroed” or set to an initial value (abaseline value). The enclosure detection engine 202 can utilize themeasurement initialization engine 204 to initialize the electricalsignal of the piezoelectric sensor. The measurement initializationengine 204 can establish the initial pressure measurement from thepiezoelectric sensor as a baseline or initial value for pressure. Anysubsequent changes to pressure between the enclosure and the fixture aremeasured in relation to the initial value. For example, if the pressurebetween the enclosure and the fixture is greater than the initial value,the pressure is expressed as some number or value larger than theinitial value. As another example, if the pressure between the enclosureand the fixture is less than the initial value, the pressure isexpressed as some number or value smaller than the initial value. Themeasurement initialization engine 204 will be discussed in furtherdetail with respect to FIG. 4A herein.

The torque conversion engine 206 can convert pressure measured by apiezoelectric sensor to torque values. The torque conversion engine 206can convert pressure to torque values based on a calibration curve. Forexample, once a piezoelectric sensor has been initialized to an initialvalue (e.g., “zeroed”), any changes in pressure in relation to theinitial value can be expressed as a mathematical function of torquevalue. For instance, a numerical change in pressure can be expressed assome change in torque value in accordance with the mathematicalfunction. In some embodiments, the calibration curve can be a linearfunction, a polynomial function, or an exponential function. In someembodiments, the calibration curve can be a combination of theaforementioned functions. In some embodiments, the calibration curve canbe implemented as a lookup table. Many variations are possible.

The notification engine 208 can generate a notification based on atorque value. The notification engine 208 can generate a notificationonce a desired torque value is reached as determined by the torqueconversion engine 206. For example, when a mechanical coupling device istighten to a desired torque value, the notification engine 208 cangenerate a notification to a user that the desired torque value has beenreached. In some embodiments, the notification engine 208 can generate anotification based on an audio cue. For example, the notification engine208 can emit a discrete sound signature (e.g., a beeping sound) when thedesired torque value is reached. In some embodiments, the notificationengine 208 can generate a notification based on a visual cue. Forexample, the notification engine 208 can emit a pulsing light toindicate that the desired torque value is reached. Many variations arepossible.

The theft response engine 210 can detect a sudden or abrupt change inpressure as measured by a piezoelectric sensor. Once an enclosure issecured and properly torqued to a fixture, the theft response engine 210can be activated. When activated, the theft response engine 210 canmonitor torque values exerted by the enclosure to the fixture. Forexample, once an enclosure is secured and properly torqued to a fixtureof an autonomous vehicle, the theft response engine 210 can be activatedto continuously monitor, around the clock, torque values exerted by oneor more mechanical coupling devices used to secured the enclosure. Insome embodiments, the theft response engine 210 can determine that atheft has occurred by measuring a degree or an amount of change betweentwo pressure measurements. For example, at a first time, pressurebetween an enclosure and a fixture is at a first value. At a secondtime, some time after the first time, the pressure between the enclosureand the fixture decreases from the first value to a second value. Inthis example, if the amount of decrease in pressure satisfies somethreshold value, it may be an indication for theft and the theftresponse engine 210 can send out an alert. In some embodiments, thetheft response engine 210 can determine that a theft occurred bymeasuring a rate of change in pressure. For example, when an enclosurethat has been affixed to a fixture is forcibly removed from the fixture,corresponding pressure may change from a first value to a second value,the second value being less than the first value. If a rate of changefrom the first value to the second value satisfies some threshold rate,it may be an indication for theft and the theft response engine 210 cansend out an alert. In some embodiments, the theft response engine 210can emit an audio to alert others when a theft occurs. For example, thetheft response engine 210 can emit a loud, ear piercing sound (e.g., asiren) to alert others of the theft. In some embodiments, the theftresponse engine 210 can emit light to alert others when a theft occurs.For example, the theft response engine 210 can turn on lights (e.g.,headlights, taillights, etc.) to alert others of the theft. In somecases, the lights can pulsate at a particular frequency (e.g., twice asecond, three times a second, etc.). In some embodiments, the theftresponse engine 210 can use on-board cameras (e.g., cameras encased byan enclosure) to take pictures of a surrounding. For example, upon anindication of theft, the theft response engine 210 can instruct camerasin the enclosure to take pictures in hops of capturing photos of theperpetrator. In some cases, these photos can be transmitted via anetwork connection to an entity, such as an autonomous vehicle fleetoperator. In some embodiments, the theft response engine 210 can informthe autonomous vehicle fleet operator of the theft. For example, thetheft response engine 210 can transmit a signal, via the networkconnection, such as a cellular network, to the autonomous vehicle fleetoperator to inform the operator of the theft. In some cases, the theftresponse engine 210 can automatically report the theft to governmentauthorities, such as a local police. In some embodiments, the theftresponse engine 210 may track location of the enclosure. For example, anenclosure may be embedded with a global positioning system (GPS). Inthis example, the theft response engine 210 may use the GPS included inthe enclosure to help track down the enclosure if the enclosure wasunauthorizedly removed. The theft response engine 210 will be discussedin further detail with respect to FIG. 4B herein.

In some embodiments, the theft response engine 210 can configure apiezoelectric sensor to emit a sound in response to a detection of atheft. The piezoelectric sensor can comprise a piezoelectric diskadhered to a diaphragm housed inside a sensor housing. In someembodiments, the piezoelectric disk can be made from crystals, such asquartz, langasite, gallium orthophosphate, lithium niobate, or lithiumtantalate, for example. In some embodiments, the piezoelectric disk canbe made from ceramics, such as barium titanate, lead zirconate titanate,potassium niobate, sodium tungstate, zinc oxide, sodium potassiumniobate, bismuth ferrite, sodium niobate, barium titanate, bismuthtitanate, or sodium bismuth titanate for example. In some embodiments,the diaphragm can be made from metallic materials, such as brass, nickelalloy, or other suitable alloy. As discussed above, in some embodiments,the piezoelectric sensor can output an electric signal (e.g., a voltage)based on pressure exerted to the piezoelectric sensor. Alternatively,when a voltage is applied to the piezoelectric sensor, the piezoelectricdisk of the piezoelectric sensor can either elongate (stretch) orcontract (shrink) depending on the polarity of the voltage applied. Forexample, in some embodiments, when a positive voltage is applied to thepiezoelectric sensor, the piezoelectric disk can elongate, expand, orstretch in response; when a negative voltage is applied, thepiezoelectric disk can contract, shorten, or shrink in response. In someembodiments, the piezoelectric sensor can be configured to emit a soundby an application of an alternating voltage to the piezoelectric sensor.The alternating voltage can change its polarity (e.g., from positive tonegative or from negative to positive) at a particular frequency. Thealternating voltage can cause the piezoelectric disk to elongate andcontract in response. The elongation and the contraction of thepiezoelectric disk can cause the diaphragm, to which the piezoelectricdisk is adhered to, to bend or flex in a back and forth motion. Thebending or the flexing of the diagram can cause sound waves in air thatis audible as a sound. In some embodiments, the sound emitted from thepiezoelectric sensor can be tuned to a specific frequency by adjusting asize of the diaphragm. For example, the larger the diaphragm, the lowerthe frequency of the sound. As another example, the smaller thediaphragm, the higher the frequency of the sound. In some embodiments,the sound can be tuned to a specific frequency by adjusting a frequencyat which the alternating voltage signal changes its polarity. Forexample, the faster the polarity changes, the higher the frequency ofthe sound. In some embodiments, sound emitted from the piezoelectricsensor can be amplified by tuning the frequency of the sound close to ornear a resonant frequency associated with the piezoelectric sensor. Bytaking advantage of this resonance, an amplitude of the sound emittedfrom the piezoelectric sensor can be increased by ways of constructivelyinterfering with the resonance. In some embodiments, the piezoelectricsensor can be coupled or adhered to an acoustical cone or surface toamplify the sound emitted from the piezoelectric sensor. In suchembodiments, the sound can be amplified by the acoustical cone orsurface through the back and forth motion of the diaphragm. Using apiezoelectric sensor to emit sound will be discussed in further detailwith respect to FIGS. 4C and 4D herein.

FIG. 3A illustrates a cross-sectional view of an example enclosuredetection system 300, according to an embodiment of the presentdisclosure. FIG. 3A depict a scenario in which an enclosure is beingtranslated and secured to a final alignment location on a fixture of anautonomous vehicle. As depicted, the enclosure detection system 300includes an enclosure 302 mounted to a fixture 304 of an autonomousvehicle through one or more clamps (e.g., a clamp 308) at one or moremounting points associated with the enclosure 302. The one or moreclamps allows the enclosure 302 to translate (e.g., move, glide, etc.)to a final alignment location along the fixture 304. In someembodiments, the enclosure 302 can include a piezoelectric sensor 310,disposed between the enclosure 302 and the fixture 304, underneath theenclosure 302, at each mounting point. The piezoelectric sensor 310 canmeasure pressure exerted by the enclosure 302 to the fixture 304. Oncethe enclosure 302 has been translated to the final alignment location,the piezoelectric sensor 310 can be zeroed or initialized to an initialvalue. This initialization allows the piezoelectric sensor 310 tomeasure pressure changes relative to the initial value. The enclosure302 can be secured to the fixture 304 at the final alignment locationusing one or more mechanical coupling devices (e.g., a mechanicalcoupling device 306). The one or more mechanical coupling devices can bescrews, nuts and bolts, rivets, fasteners, or Velcro, for example. Asthe one or more mechanical coupling devices are tightened to secure theenclosure 302, the pressure exerted by the enclosure 302 to the fixture304 at each mounting point, as measured by the piezoelectric sensor 310,increases. This pressure can be converted to a torque value using acalibration curve as discussed with respect to FIG. 2. In someembodiments, once the torque value at each mounting point reaches acertain desired toque value, the enclosure detection system 300 can emitan audio cue informing that a mechanical coupling device (i.e., themechanical coupling device 306) corresponding to a piezoelectric sensor(i.e., the piezoelectric sensor 310) has been tightened to the desiredtorque value. In some cases, instead of an audio cue, a visual cue, suchas blinking lights, can be emitted. Many variations are possible.

FIG. 3B illustrates an example of an enclosure 320 for a sensor systemaccording to an embodiment of the present disclosure. The enclosure 320may be implemented as enclosure 302, for example. FIG. 3B may include acover 362 to encase a sensor system, which may include LiDAR sensor 330and cameras 332. For example, the cover 362 may be detachable orremovable to allow easy access to the sensor system. In someembodiments, the cover 362 can rotate circularly, or in three hundredsixty degrees, relative to the sensor system about a central verticalaxis of the cover 362. In some embodiments, the cover 362 may have aprofile or shape that has a low wind resistance or coefficient of drag,and thereby reducing negative impacts to fuel economy of the autonomousvehicle. For example, the cover 362 may have a smooth surface so that aboundary layer formed between the air and the cover 362 would be laminarrather than turbulent. For example, the cover 362 may have a sleekangular profile. In some embodiments, the outer contour of the cover 362can have multiple distinct sections (e.g., portions, regions, etc.) withdifferent shapes. For example, a top portion of the cover 362 may have acircular dome shape with a first diameter measured at a base of the topportion and may encase the LiDAR sensor 330 of the autonomous vehicle. Amiddle portion of the cover 362 directly below the top portion may havea trapezoidal or truncated cone shape with a second diameter measured ata base on the middle portion, and the second diameter may be larger thanthe first diameter. A lower portion of the cover 362 directly below themiddle portion may have a trapezoidal or truncated cone shape with athird diameter measured at a base on the lower portion. The thirddiameter may be larger than the second diameter. In other embodiments,the cover 362 may be entirely comprised of a single shape, such as acircular dome shape, a trapezoidal or truncated cone shape.

The cover 362 may be made from any suitable material that allows the oneor more sensors of the enclosure 320 to properly function whileshielding the one or more sensors from environmental elements (e.g.,rain, snow, moisture, wind, dust, radiation, oxidation, etc.). Further,the suitable material must be transparent to wavelengths of light orelectro-magnetic waves receptive to the LiDAR sensor 330 and theplurality of cameras 332. For example, for the LiDAR sensor 330 toproperly operate, the cover 362 must allow laser pulses emitted from theLiDAR sensor 330 to pass through the cover 362 to reach a target andthen reflect back through the cover 362 and back to the LiDAR sensor330. Similarly, for the plurality of cameras 332 to properly operate,the cover 362 must allow visible light to enter. In addition to beingtransparent to wavelengths of light, the suitable material must also beable to withstand potential impacts from roadside debris without causingdamages to the LiDAR sensor 330 or the plurality of cameras 332. In animplementation, the cover 362 can be made of acrylic glass (e.g., Cylux,Plexiglas, Acrylite, Lucite, Perspex, etc.). In another implementation,the cover 362 can be made of strengthen glass (e.g., Coring® Gorilla®glass). In yet another implementation, the cover 362 can be made oflaminated safety glass held in place by layers of polyvinyl butyral(PVB), ethylene-vinyl acetate (EVA), or other similar chemicalcompounds. Many implementations are possible and contemplated.

In some embodiments, the cover 362 can be tinted with a thin-film neuralfilter to reduce transmittance of light entering the cover 362. Forexample, in an embodiment, a lower portion of the cover 362 can beselectively tinted with the thin-film neutral filter to reduce anintensity of visible light seen by the plurality of cameras 332. In thisexample, transmittance of laser pulses emitted from the LiDAR sensor 330is not be affected by the tint because only the lower portion of thecover 342 is tinted. In another embodiment, the lower portion of thecover 362 can be tinted with a thin-film graduated neural filter inwhich the transmittance of visible light can vary along an axis. In yetanother embodiment, the whole cover 362 can be treated or coated with areflective coating such that the components of the enclosure 320 is notvisible from an outside vantage point while still being transparent towavelengths of light receptive to the LiDAR sensor 330 and the pluralityof cameras 332. Many variations, such as adding a polarization layer oran anti-reflective layer, are possible and contemplated.

In some embodiments, the enclosure 320 may comprise a frame 334, a ring336, and a plurality of anchoring posts 338. The frame 334 providesmechanical support for the LiDAR sensor 330 and the plurality of cameras332. The ring 336 provides mounting points for the cover 362 such thatthe cover 362 encases and protects the sensor system from environmentalelements. The plurality of anchoring posts 338 provides mechanicalcouplings to secure or mount the enclosure 320 to the autonomousvehicle.

In some embodiments, the frame 334 may have two base plates held inplace by struts 340. An upper base plate of the frame 334 may provide amounting surface for the LiDAR sensor 330 while a lower base plate ofthe frame 334 may provide a mounting surface for the plurality ofcameras 332. In general, any number of LiDAR sensors 330 and cameras 332may be mounted to the frame 334. The frame 334 is not limited to havingone LiDAR sensor and six cameras as shown in FIG. 3B. For example, in anembodiment, the frame 334 can have more than two base plates held inplace by the struts 340. In this example, the frame 334 may have threebase plates with upper two base plates reserved for two LiDAR sensors330 and a lower base plate for six cameras 332. In another embodiment,the lower base plate can have more than six cameras 332. For instance,there can be three cameras pointed in a forward direction of anautonomous vehicle, two cameras pointed to in a right and a leftdirection of the autonomous vehicle, and two cameras pointed in areverse direction of the autonomous vehicle. Many variations arepossible.

The frame 334 may include a temperature sensor 342, a fan 344, an airconditioning (AC) vent or cabin vent 346, and a pressure sensor 355. Thetemperature sensor 342 can be configured to measure a temperature of theenclosure 320. In general, the temperature sensor 342 can be placedanywhere on the frame 334 that is representative of the enclosuretemperature. In a typical implementation, the temperature sensor 342 isplaced in a region in which heat generated by the LiDAR sensor 330 andthe plurality of cameras 332 are most localized. In the example of FIG.3B, the temperature sensor 342 is placed on the lower base plate of theframe 334, right behind the three front cameras. The fan 344 can beconfigured to draw an inlet airflow from an external source. The fan344, in various implementations, works in conjunction with thetemperature sensor 342 to maintain a steady temperature condition insidethe enclosure 320. The fan 344 can vary its rotation speed depending onthe enclosure temperature. For example, when the enclosure temperatureis high, as measured by the temperature sensor 342, the fan 344 mayincrease its rotation speed to draw additional volume of air to lowerthe temperature of the enclosure 320 and thus cooling the sensors.Similarly, when the temperature of the enclosure 320 is low, the fan 344does not need to operate as fast. The fan 344 may be located centrallyon the lower base plate of the frame 334. The AC vent or cabin vent 346may be a duct, tube, or a conduit that conveys cooling air into theenclosure 320. In an embodiment, the AC vent or cabin vent 346 may beconnected to a cabin of the autonomous vehicle. In another embodiment,the AC vent or cabin vent 346 may be connected to a separate airconditioner unit that provides cooling air separate from the cabin ofthe autonomous vehicle. The AC vent or cabin vent 346 may be directlyconnected to the enclosure 320 at a surface of the frame 334. Thepressure sensor 355 may be configured to determine an internal airpressure of the enclosure 320.

In some embodiments, the frame 334 can also include a powertrain. Thepowertrain is an electric motor coupled to a drivetrain comprising oneor more gears. The powertrain can rotate the ring 336 clockwise orcounter-clockwise. In various embodiments, the electric motor can be adirect current brush or brushless motor, or an alternate currentsynchronous or asynchronous motor. Many variations are possible. Invarious embodiments, the one or more gears of the drivetrain can beconfigured to have various gear ratios designed to provide variousamounts of torque delivery and rotational speed.

In general, the frame 334 can be made from any suitable materials thatcan withstand extreme temperature swings and weather variousenvironmental conditions (e.g., rain, snow, corrosion, oxidation, etc.).The frame 334 can be fabricated using various metal alloys (e.g.,aluminum alloys, steel alloys, etc.). The frame 334 can also befabricated with three dimensional printers using thermoplastics (e.g.,polylactic acid, acrylonitrile butadiene styrene, polyamide, high impactpolystyrene, thermoplastic elastomer, etc.). Similarly, the air duct 346can be made from rigid materials (e.g., hard plastics, polyurethane,metal alloys, etc.) or semi-rigid materials (e.g., rubber, silicone,etc.). Many variations are possible.

The ring 336 can provide mounting points for the cover 362 to encase theinternal structure 304 of the enclosure 320. In the example of FIG. 3B,the ring 336 has an outer portion that includes attaching points 348through which the cover 362 can be attached and secured. The ring 336also has an inner portion that comprises gear teeth 350 (or cogs) suchthat when the gear teeth 350 is driven by the powertrain of the frame334, the whole ring 336 rotates as a result.

Similar to the frame 334, the ring 336 can be made from any suitablematerial that can withstand extreme temperature swings and weathervarious environmental conditions. However, in most implementations, thesuitable material for the ring 336 must be somewhat more durable thanthe material used for the frame 334. This is because the gear teeth 350of the ring 336 are subject to more wear and tear from being coupled tothe powertrain of the frame 334. The ring 336 can be fabricated usingvarious metal alloys (e.g., carbon steel, alloy steel, etc.). The ring336 can also be fabricated with three dimensional printers usingthermoplastics (e.g., polylactic acid, acrylonitrile butadiene styrene,polyamide, high impact polystyrene, thermoplastic elastomer, etc.).

The plurality of the anchoring posts 338 can provide mechanicalcouplings to secure or mount the enclosure 320 to an autonomous vehicle.In general, any number of anchoring posts 338 may be used. In theexample of FIG. 3B, the enclosure 320 is shown with eight anchoringposts: four anchoring posts to secure the frame 334 to the autonomousvehicle and four anchoring posts to secure the ring 336 to theautonomous vehicle. Similar to the frame 334 and the ring 336, theplurality of the anchoring posts 338 can be made from any suitablematerials and fabricated using metal alloys (e.g., carbon steel, alloysteel, etc.) or three dimensional printed with thermoplastics (e.g.,polylactic acid, acrylonitrile butadiene styrene, polyamide, high impactpolystyrene, thermoplastic elastomer, etc.).

A first vent 354 and/or a second vent 356 may be disposed on the cover362. For example, the first vent 354 may be disposed on near the frame344 or between the upper base plate of the frame 334 and the lower baseplate of the frame 334. For example, the second vent 356 may be disposedat or near the top of the cover 362. The first vent 354 allows air fromoutside to flow into the enclosure 320, and may be used to preventhumidification and/or overheating. The second vent 356 allows warm/hotair to be expelled from the enclosure 320. The first vent 354 and/or thesecond vent 356 may be conducive to laminar flow of air. For example, aboundary layer created by the air entering and the first vent 354 wouldbe laminar so that the boundary layer does not create turbulent flow.The first vent 354 and/or the second vent 356 may comprise a smoothorifice, and may be shaped to have a circular or elliptical crosssection. The first vent 354 and/or the second vent 356 may be shaped sothat the Reynolds number of air flowing through the second vent 356 maybe at most 2000, to create laminar flow. In some embodiments, theReynolds number of air flowing through the first vent 354 and/or thesecond vent 356 may be at most 3000, or at most 1000.

A controller 352 may be disposed on the frame 334, the upper base plateof the frame 334, or the lower base plate of the frame 334. Thecontroller 352 may control the operations of one of more of the LiDARsensor 330, the cameras 332, the temperature sensor 342, the fan 344,the AC vent or cabin vent 346, the first vent 354, and/or the secondvent 356.

For example, the controller 352 may regulate a rotation speed of the fan344 based on a speed of the vehicle, a temperature measured by thetemperature sensor 342, an external temperature, or a difference betweenthe temperature measured by the temperature sensor 342 and the externaltemperature, and operate the fan 344 at the regulated rotation speed.For example, the controller 352 may regulate a rotation speed of the fan344 based on any combination of the aforementioned factors. As anexample, the controller 352 may regulate a rotation speed of the fan 344based on whether the access from the enclosure 320 to the AC vent orcabin vent 346 is turned on. For example, the controller 352 mayincrease or decrease a rotation speed of the fan 344 if the access fromthe enclosure 320 to the AC vent or cabin vent 346 is turned off (e.g.,no air flows from the AC vent or cabin vent 346 to the enclosure 320).For example, the controller 352 may increase or decrease a rotationspeed of the fan 344 if the access from the enclosure 320 if the accessfrom the enclosure 320 to the AC vent or cabin vent 346 is turned on.For example, the controller 352 may regulate a rotation speed of the fan344 based on a level of wind external to the enclosure 320. For example,the level of wind may be determined by an amount of airflow enteringthrough the first vent 354. For example, if enough air is enteringthrough the first vent 354 to provide cooling and/or ventilation, thecontroller 352 may reduce the rotation speed of the fan 344 or shut offthe fan 344. Furthermore, the controller 352 may, in addition to, orinstead of, regulating the rotation speed of the fan 344, regulate anamount of air entering from the AC vent or cabin vent 346, for example,depending or based on how much cooling is required for one or more ofthe sensors of the enclosure 320. For example, the controller 352 mayregulate the amount of air entering into the AC vent or cabin vent 346based on one or more of, or any combination of, the speed of theautonomous vehicle, the temperature measured by the temperature sensor342, the external temperature, the difference between the temperaturemeasured by the temperature sensor 342 and the external temperature, orbased on an internal temperature of the LiDAR sensor 330 or the cameras332 (which may indicate how heavily the LiDAR sensor 330 or the cameras332 are being used). For example, the controller 352 may regulate theamount of air entering into the AC vent or cabin vent 346 by adjusting asize of an opening of the AC vent or cabin vent 346 (e.g., a radius ofthe opening of the AC vent or cabin vent 346, or by regulating an amountof air extracted into the AC vent or cabin vent 346. In anotherembodiment, the controller 352 may regulate an amount of air enteringfrom the AC vent or cabin vent 346 based on the rotation speed of thefan 344. For example, in one embodiment, if the rotation speed of thefan 344 is increased, the controller 352 may reduce the amount of airentering into the AC vent or cabin vent 346 because adequate cooling ofthe enclosure 320 may already be provided by the fan 344. In oneembodiment, the controller 352 may select between using the fan 344 andthe AC vent or cabin vent 346 to cool the enclosure 320. For example,the controller 352 may select between using the fan 344 and the AC ventor cabin vent 346 to cool the enclosure 320 based on which method ismore energy efficient. In one embodiment, the controller 352 may selectusing the fan 344 when an amount of cooling to be provided (e.g. whichmay correspond to the temperature measured by temperature sensor 342) islower than a threshold (e.g., first threshold) and using the AC vent orcabin vent 346 when the amount of cooling to be provided is greater thanthe threshold (e.g., first threshold). On the other hand, if theoperation of the fan 344 at high rotation speed itself generates heatinternally for the fan 344, the controller 352 may increase the amountof air entering into, or permit air to enter through, the AC vent orcabin vent 346 to provide cooling for the fan 344. Thus, the controller352 may increase the amount of air entering into the AC vent or cabinvent 346 as the rotation speed of the fan 344 is increased.

The controller 352 may further be configured to turn on or turn offaccess from the AC vent or cabin vent 346 to the enclosure 320 based onthe temperature of the enclosure 320 measured by the temperature sensor342 or the internal air pressure of the enclosure 320 measured by thepressure sensor 355. For example, an increase in the internaltemperature of the enclosure 320 may result in changes in internal airpressure of a portion of the enclosure 320 because warmer air rises. Tocompensate for changes in the temperature and/or pressure inside theenclosure 320, the AC vent or cabin vent 346 may be turned on to allowAC air or cabin air to flow into the AC vent or cabin vent 346.Furthermore, the controller 352 may be configured to increase ordecrease an amount of AC air or cabin air going into the enclosure 320,for example, by increasing or decreasing a size of the AC vent or cabinvent 346. In another embodiment, the controller 352 may be configured toincrease or decrease an amount of AC air or cabin air, for example,based on a gradient of temperature inside the enclosure 320 or agradient of pressure inside the enclosure 320. As an example, if agradient of temperature inside the enclosure 320 exceeds a threshold(e.g., second threshold), the controller 352 may be configured toincrease or decrease an amount of AC air or cabin air. As an example, ifa gradient of pressure inside the enclosure 320 exceeds a threshold(e.g., third threshold), the controller 352 may be configured toincrease or decrease an amount of AC air or cabin air.

The controller 352 may further adjust a rotation speed of the fan 344,and/or an amount of air entering the AC vent or cabin vent 346, based onone or any combination of predicted future conditions, such asanticipated speed, anticipated external temperature, or anticipatedinternal temperature of the enclosure 320. For example, if thecontroller 352 predicts, based on a navigation route selected, orweather forecast, that the temperature at a destination is high, thecontroller may preemptively precool the enclosure 320 by increasing therotation speed of the fan 344 or increasing the amount of air enteringthe AC vent or cabin vent 346. As another example, if the controller 352predicts that the LiDAR sensor 330 or the cameras 332 will be heavilyused in a near future, the controller may preemptively precool theenclosure 320 by increasing the rotation speed of the fan 344 orincreasing the amount of air entering the AC vent or cabin vent 346. Asanother example, if the controller 352 predicts that the vehicle speedwill increase based on a type of road (e.g., highway), trafficconditions, road conditions, and/or amount of battery/gasolineremaining, the controller may preemptively precool the enclosure 320 byincreasing the rotation speed of the fan 344 or increasing the amount ofair entering the AC vent or cabin vent 346.

Optionally, the enclosure 320 also comprises a filter 360, or one ormore filters 360, to filter debris. In one embodiment, the filter 360 isa HEPA filter. The one or more filters 360 may be disposed on an upperbase plate of the frame 334, a lower base plate of the frame 334, or theframe 334. Additionally or alternatively, the one or more filters 360may be disposed at an inlet of the first vent 354. The activity of thefilter 360 may be controlled by the controller 352. For example, if adetected level of debris is high, the controller 352 may increase anactivity level of the filter 360 (e.g. a heavy-duty mode). In contrast,if a detected level of debris is low, the controller 352 may decrease anactivity level of the filter 360 (e.g. a light-duty mode). The filter360 may further be adjusted to filter out particles of specific rangesof sizes (e.g., by the controller 352).

FIG. 4A illustrates a torque measurement scenario 400, according to anembodiment of the present disclosure. FIG. 4A depicts a scenario inwhich an enclosure is being translated and secured to a final alignmentlocation on a fixture of an autonomous vehicle. In various embodiments,the enclosure can include one or more piezoelectric sensors at one ormore mounting points of the enclosure. An example x-y plot is presentedin FIG. 4A. The x-y plot can represent a plot of pressure data measuredby a piezoelectric sensor over a period of time spanning an alignmentprocess for the enclosure. An x-axis of the x-y plot represents time. Ay-axis of the x-y plot represents pressure data measured over the periodof time spanning the alignment process. In the scenario 400 depicted, aregion 402 on the plot corresponds to pressure data measured by thepiezoelectric sensor (e.g., the piezoelectric sensor 310 of FIG. 3A)while the enclosure has not been mounted to the fixture. This pressuredata (e.g., the region 402) represents no load value because theenclosure has not been mounted to the fixture. Once the enclosure ismounted to the fixture, the pressure data measured by the piezoelectricsensor increases due to pressure exerted by the enclosure to thefixture. This increase of pressure data is represented by a region 404on the plot. At some time later, after the enclosure has been translatedto the final alignment location, the pressure data from thepiezoelectric sensor is “zeroed” or set to an initial value indicated bya point 406 on the plot. As the enclosure is secured with one or moremechanical coupling devices (e.g., screws, nuts and bolts, rivets,fasteners, etc.), the pressure data measured by the piezoelectric sensorincreases again as indicated by a region 408 on the plot. This pressuredata (e.g., the region 408) can be converted to torque values. As theone or more mechanical coupling devices are tightened, at some point,the pressure data as measured by the piezoelectric sensor willcorrespond to a desired torque value as indicated a point 410 on theplot. At this time, an audio or visual cue can be emitted to indicatethat the desired torque value has been reached and the one or moremechanical coupling devices no longer need to be tightened.

FIG. 4B illustrates a theft detection scenario 420, according to anembodiment of the present disclosure. FIG. 4B describes a scenario inwhich an enclosure is unauthorizedly removed from a fixture of anautonomous vehicle. An example x-y plot is presented in FIG. 4B. The x-yplot can represent a plot of pressure data measured by a piezoelectricsensor over some period of time. Similar to FIG. 4A, an x-axis of thex-y plot represents time and an y-axis of the x-y plot representspressure or pressure data. In this scenario 420, the enclosure isalready secured and properly torqued to the fixture as indicated by aregion 422 of the plot (e.g., “Torqued Value”). If the enclosure isremoved from the fixture, the enclosure no longer exerts pressure to thefixture, and correspondingly, pressure data changes in response to theremoval of the enclosure (e.g., “Enclosure Removed From Fixture”). Thepressure data as measured by the piezoelectric sensor reverts back to apressure value indicated by a region 424 of the plot (e.g., “No LoadValue”). This pressure value indicates an absence of pressure betweenthe enclosure and the fixture, thus an indication that enclosure hasbeen removed from the fixture.

FIG. 4C illustrates a theft response scenario 440, according to anembodiment of the present disclosure. FIG. 4C depicts a theft responseengine 442 electrically coupled to a piezoelectric sensor 444. Thepiezoelectric sensor 444 can comprise a piezoelectric disk 446 adheredto a diaphragm 448. In some embodiments, the theft response engine 442can be implemented with the theft response engine 210 of FIG. 2. Asdiscussed, in various embodiments, the theft response engine 442 can beconfigured to detect theft of an enclosure using the piezoelectricsensor 444. In some cases, the theft response engine 442, upon adetection of theft, can configure the piezoelectric sensor 444 to emit asound. The scenario 440 depicts two configurations 450 and 452 for thetheft response engine 442 through which the sound can be emitted fromthe piezoelectric sensor 444. In the configuration 450, the theftresponse engine 442 outputs a positive voltage with respect to twoterminals of the piezoelectric sensor 444. This positive voltage cancause the piezoelectric disk 446 to elongate or stretch. Because thepiezoelectric disk 446 is adhered to the diaphragm 448 and the diaphragmis unresponsive to the voltage, the elongation of the piezoelectric disk446 can cause the diaphragm 448 to bend or flex in one direction. InFIG. 4C, the diaphragm 448 is shown to bend toward the left. In theconfiguration 452, the theft response engine 442 outputs a negativevoltage with respect to the two terminals of the piezoelectric sensor444. This negative voltage can cause the piezoelectric disk 446 tocontract or shrink. The contraction of the piezoelectric disk 446 cancause the diaphragm 448 to bend or flex in the opposite direction. InFIG. 4C, the diaphragm 448 is shown to bend toward the right. When thetheft response engine 442 outputs an alternating voltage to thepiezoelectric sensor 444, the alternating voltage causes the diaphragm448 to bend left and right (a back and forth motion), which can causesound waves in air that are audible as a sound. In some embodiments, thediaphragm 448 can be adhered to an acoustical cone or surface (notshown). In such embodiments, the back and forth motion of the diaphragm448 can cause the acoustical cone or surface to correspondingly move ina back and forth motion. The back and forth motion of the acousticalcone or surface can cause larger sound waves in air, resulting in soundamplification.

FIG. 4D illustrates an x-y plot 460 for amplifying a sound emitted froma piezoelectric sensor, according to an embodiment of the presentdisclosure. FIG. 4D describes a scenario in which a theft responseengine (e.g., the theft response engine 442 of FIG. 4C) has detected atheft of an enclosure and is outputting an alternating voltage to apiezoelectric sensor to cause the piezoelectric sensor to emit a sound.In the x-y plot 460, an x-axis represents frequency of the sound and ay-axis represents sound level or amplitude of the sound. In the x-y plot460, the sound emitted from the piezoelectric sensor is represented by asound profile 462. The sound profile 462 comprises sounds at variousfrequencies and at various amplitudes. A frequency 466 of the sound(e.g., the sound profile 462) can be tuned by varying a size or adiameter of a diaphragm associated the piezoelectric sensor. Forexample, the larger the size or the diameter of the diaphragm, the lowerthe frequency 466. Similarly, the smaller the size or the diameter ofthe diaphragm, the higher the frequency 466. As discussed with respectto FIG. 2, the sound emitted from the piezoelectric sensor can be tunedto be near a resonant sound associated with the piezoelectric sensor sothat the sound can be naturally amplified. In the x-y plot 460, theresonant sound associated with the piezoelectric sensor is representedby a sound profile 464. By tuning the frequency 466 of the sound to benear a frequency 468 of the resonant sound, portions of the two soundprofiles 462 and 464 may overlay. This overlay causes the two soundprofiles 462 and 464 to constructively interfere with one another. Thisconstructive interference, in turn, creates a resulting sound profile470 that is an amplification of the sound profile 462.

FIG. 5 illustrates an example method 500, according to an embodiment ofthe present disclosure. The operations of method 500 presented below areintended to be illustrative. Depending on the implementation, theexample method 500 may include additional, fewer, or alternative stepsperformed in various orders or in parallel. The example method 500 maybe implemented in various computing systems or devices including one ormore processors.

At block 502, theft of a sensor enclosure can be detected using at leastone piezoelectric sensor. At block 504, an electrical signal to the atleast one piezoelectric sensor can be generated. At block 506, the atleast one piezoelectric sensor can be caused to emit a sound based onthe electric signal.

Hardware Implementation

The techniques described herein are implemented by one or morespecial-purpose computing devices. The special-purpose computing devicesmay be hard-wired to perform the techniques, or may include circuitry ordigital electronic devices such as one or more application-specificintegrated circuits (ASICs) or field programmable gate arrays (FPGAs)that are persistently programmed to perform the techniques, or mayinclude one or more hardware processors programmed to perform thetechniques pursuant to program instructions in firmware, memory, otherstorage, or a combination. Such special-purpose computing devices mayalso combine custom hard-wired logic, ASICs, or FPGAs with customprogramming to accomplish the techniques. The special-purpose computingdevices may be desktop computer systems, server computer systems,portable computer systems, handheld devices, networking devices or anyother device or combination of devices that incorporate hard-wiredand/or program logic to implement the techniques.

Computing device(s) are generally controlled and coordinated byoperating system software, such as iOS, Android, Chrome OS, Windows XP,Windows Vista, Windows 7, Windows 8, Windows Server, Windows CE, Unix,Linux, SunOS, Solaris, iOS, Blackberry OS, VxWorks, or other compatibleoperating systems. In other embodiments, the computing device may becontrolled by a proprietary operating system. Conventional operatingsystems control and schedule computer processes for execution, performmemory management, provide file system, networking, I/O services, andprovide a user interface functionality, such as a graphical userinterface (“GUI”), among other things.

FIG. 6 is a block diagram that illustrates a computer system 600 uponwhich any of the embodiments described herein may be implemented. Thecomputer system 600 includes a bus 602 or other communication mechanismfor communicating information, one or more hardware processors 604coupled with bus 602 for processing information. Hardware processor(s)604 may be, for example, one or more general purpose microprocessors.

The computer system 600 also includes a main memory 606, such as arandom access memory (RAM), cache and/or other dynamic storage devices,coupled to bus 602 for storing information and instructions to beexecuted by processor 604. Main memory 606 also may be used for storingtemporary variables or other intermediate information during executionof instructions to be executed by processor 604. Such instructions, whenstored in storage media accessible to processor 604, render computersystem 600 into a special-purpose machine that is customized to performthe operations specified in the instructions.

The computer system 600 further includes a read only memory (ROM) 608 orother static storage device coupled to bus 602 for storing staticinformation and instructions for processor 604. A storage device 610,such as a magnetic disk, optical disk, or USB thumb drive (Flash drive),etc., is provided and coupled to bus 602 for storing information andinstructions.

The computer system 600 may be coupled via bus 602 to a display 612,such as a cathode ray tube (CRT) or LCD display (or touch screen), fordisplaying information to a computer user. An input device 614,including alphanumeric and other keys, is coupled to bus 602 forcommunicating information and command selections to processor 604.Another type of user input device is cursor control 616, such as amouse, a trackball, or cursor direction keys for communicating directioninformation and command selections to processor 604 and for controllingcursor movement on display 612. This input device typically has twodegrees of freedom in two axes, a first axis (e.g., x) and a second axis(e.g., y), that allows the device to specify positions in a plane. Insome embodiments, the same direction information and command selectionsas cursor control may be implemented via receiving touches on a touchscreen without a cursor.

The computing system 600 may include a user interface module toimplement a GUI that may be stored in a mass storage device asexecutable software codes that are executed by the computing device(s).This and other modules may include, by way of example, components, suchas software components, object-oriented software components, classcomponents and task components, processes, functions, attributes,procedures, subroutines, segments of program code, drivers, firmware,microcode, circuitry, data, databases, data structures, tables, arrays,and variables.

In general, the word “module,” as used herein, refers to logic embodiedin hardware or firmware, or to a collection of software instructions,possibly having entry and exit points, written in a programminglanguage, such as, for example, Java, C or C++. A software module may becompiled and linked into an executable program, installed in a dynamiclink library, or may be written in an interpreted programming languagesuch as, for example, BASIC, Perl, or Python. It will be appreciatedthat software modules may be callable from other modules or fromthemselves, and/or may be invoked in response to detected events orinterrupts. Software modules configured for execution on computingdevices may be provided on a computer readable medium, such as a compactdisc, digital video disc, flash drive, magnetic disc, or any othertangible medium, or as a digital download (and may be originally storedin a compressed or installable format that requires installation,decompression or decryption prior to execution). Such software code maybe stored, partially or fully, on a memory device of the executingcomputing device, for execution by the computing device. Softwareinstructions may be embedded in firmware, such as an EPROM. It will befurther appreciated that hardware modules may be comprised of connectedlogic units, such as gates and flip-flops, and/or may be comprised ofprogrammable units, such as programmable gate arrays or processors. Themodules or computing device functionality described herein arepreferably implemented as software modules, but may be represented inhardware or firmware. Generally, the modules described herein refer tological modules that may be combined with other modules or divided intosub-modules despite their physical organization or storage.

The computer system 600 may implement the techniques described hereinusing customized hard-wired logic, one or more ASICs or FPGAs, firmwareand/or program logic which in combination with the computer systemcauses or programs computer system 600 to be a special-purpose machine.According to one embodiment, the techniques herein are performed bycomputer system 600 in response to processor(s) 604 executing one ormore sequences of one or more instructions contained in main memory 606.Such instructions may be read into main memory 606 from another storagemedium, such as storage device 610. Execution of the sequences ofinstructions contained in main memory 606 causes processor(s) 604 toperform the process steps described herein. In alternative embodiments,hard-wired circuitry may be used in place of or in combination withsoftware instructions.

The term “non-transitory media,” and similar terms, as used hereinrefers to any media that store data and/or instructions that cause amachine to operate in a specific fashion. Such non-transitory media maycomprise non-volatile media and/or volatile media. Non-volatile mediaincludes, for example, optical or magnetic disks, such as storage device610. Volatile media includes dynamic memory, such as main memory 606.Common forms of non-transitory media include, for example, a floppydisk, a flexible disk, hard disk, solid state drive, magnetic tape, orany other magnetic data storage medium, a CD-ROM, any other optical datastorage medium, any physical medium with patterns of holes, a RAM, aPROM, and EPROM, a FLASH-EPROM, NVRAM, any other memory chip orcartridge, and networked versions of the same.

Non-transitory media is distinct from but may be used in conjunctionwith transmission media. Transmission media participates in transferringinformation between non-transitory media. For example, transmissionmedia includes coaxial cables, copper wire and fiber optics, includingthe wires that comprise bus 602. Transmission media can also take theform of acoustic or light waves, such as those generated duringradio-wave and infra-red data communications.

Various forms of media may be involved in carrying one or more sequencesof one or more instructions to processor 604 for execution. For example,the instructions may initially be carried on a magnetic disk or solidstate drive of a remote computer. The remote computer can load theinstructions into its dynamic memory and send the instructions over atelephone line using a modem. A modem local to computer system 600 canreceive the data on the telephone line and use an infra-red transmitterto convert the data to an infra-red signal. An infra-red detector canreceive the data carried in the infra-red signal and appropriatecircuitry can place the data on bus 602. Bus 602 carries the data tomain memory 606, from which processor 604 retrieves and executes theinstructions. The instructions received by main memory 606 may retrievesand executes the instructions. The instructions received by main memory606 may optionally be stored on storage device 610 either before orafter execution by processor 604.

The computer system 600 also includes a communication interface 618coupled to bus 602. Communication interface 618 provides a two-way datacommunication coupling to one or more network links that are connectedto one or more local networks. For example, communication interface 618may be an integrated services digital network (ISDN) card, cable modem,satellite modem, or a modem to provide a data communication connectionto a corresponding type of telephone line. As another example,communication interface 618 may be a local area network (LAN) card toprovide a data communication connection to a compatible LAN (or WANcomponent to communicated with a WAN). Wireless links may also beimplemented. In any such implementation, communication interface 618sends and receives electrical, electromagnetic or optical signals thatcarry digital data streams representing various types of information.

A network link typically provides data communication through one or morenetworks to other data devices. For example, a network link may providea connection through local network to a host computer or to dataequipment operated by an Internet Service Provider (ISP). The ISP inturn provides data communication services through the world wide packetdata communication network now commonly referred to as the “Internet”.Local network and Internet both use electrical, electromagnetic oroptical signals that carry digital data streams. The signals through thevarious networks and the signals on network link and throughcommunication interface 618, which carry the digital data to and fromcomputer system 600, are example forms of transmission media.

The computer system 600 can send messages and receive data, includingprogram code, through the network(s), network link and communicationinterface 618. In the Internet example, a server might transmit arequested code for an application program through the Internet, the ISP,the local network and the communication interface 618.

The received code may be executed by processor 604 as it is received,and/or stored in storage device 610, or other non-volatile storage forlater execution.

Each of the processes, methods, and algorithms described in thepreceding sections may be embodied in, and fully or partially automatedby, code modules executed by one or more computer systems or computerprocessors comprising computer hardware. The processes and algorithmsmay be implemented partially or wholly in application-specificcircuitry.

The various features and processes described above may be usedindependently of one another, or may be combined in various ways. Allpossible combinations and sub-combinations are intended to fall withinthe scope of this disclosure. In addition, certain method or processblocks may be omitted in some implementations. The methods and processesdescribed herein are also not limited to any particular sequence, andthe blocks or states relating thereto can be performed in othersequences that are appropriate. For example, described blocks or statesmay be performed in an order other than that specifically disclosed, ormultiple blocks or states may be combined in a single block or state.The example blocks or states may be performed in serial, in parallel, orin some other manner. Blocks or states may be added to or removed fromthe disclosed example embodiments. The example systems and componentsdescribed herein may be configured differently than described. Forexample, elements may be added to, removed from, or rearranged comparedto the disclosed example embodiments.

Conditional language, such as, among others, “can,” “could,” “might,” or“may,” unless specifically stated otherwise, or otherwise understoodwithin the context as used, is generally intended to convey that certainembodiments include, while other embodiments do not include, certainfeatures, elements and/or steps. Thus, such conditional language is notgenerally intended to imply that features, elements and/or steps are inany way required for one or more embodiments or that one or moreembodiments necessarily include logic for deciding, with or without userinput or prompting, whether these features, elements and/or steps areincluded or are to be performed in any particular embodiment.

Any process descriptions, elements, or blocks in the flow diagramsdescribed herein and/or depicted in the attached figures should beunderstood as potentially representing modules, segments, or portions ofcode which include one or more executable instructions for implementingspecific logical functions or steps in the process. Alternateimplementations are included within the scope of the embodimentsdescribed herein in which elements or functions may be deleted, executedout of order from that shown or discussed, including substantiallyconcurrently or in reverse order, depending on the functionalityinvolved, as would be understood by those skilled in the art.

It should be emphasized that many variations and modifications may bemade to the above-described embodiments, the elements of which are to beunderstood as being among other acceptable examples. All suchmodifications and variations are intended to be included herein withinthe scope of this disclosure. The foregoing description details certainembodiments of the invention. It will be appreciated, however, that nomatter how detailed the foregoing appears in text, the invention can bepracticed in many ways. As is also stated above, it should be noted thatthe use of particular terminology when describing certain features oraspects of the invention should not be taken to imply that theterminology is being re-defined herein to be restricted to including anyspecific characteristics of the features or aspects of the inventionwith which that terminology is associated. The scope of the inventionshould therefore be construed in accordance with the appended claims andany equivalents thereof.

Engines, Components, and Logic

Certain embodiments are described herein as including logic or a numberof components, engines, or mechanisms. Engines may constitute eithersoftware engines (e.g., code embodied on a machine-readable medium) orhardware engines. A “hardware engine” is a tangible unit capable ofperforming certain operations and may be configured or arranged in acertain physical manner. In various example embodiments, one or morecomputer systems (e.g., a standalone computer system, a client computersystem, or a server computer system) or one or more hardware engines ofa computer system (e.g., a processor or a group of processors) may beconfigured by software (e.g., an application or application portion) asa hardware engine that operates to perform certain operations asdescribed herein.

In some embodiments, a hardware engine may be implemented mechanically,electronically, or any suitable combination thereof. For example, ahardware engine may include dedicated circuitry or logic that ispermanently configured to perform certain operations. For example, ahardware engine may be a special-purpose processor, such as aField-Programmable Gate Array (FPGA) or an Application SpecificIntegrated Circuit (ASIC). A hardware engine may also includeprogrammable logic or circuitry that is temporarily configured bysoftware to perform certain operations. For example, a hardware enginemay include software executed by a general-purpose processor or otherprogrammable processor. Once configured by such software, hardwareengines become specific machines (or specific components of a machine)uniquely tailored to perform the configured functions and are no longergeneral-purpose processors. It will be appreciated that the decision toimplement a hardware engine mechanically, in dedicated and permanentlyconfigured circuitry, or in temporarily configured circuitry (e.g.,configured by software) may be driven by cost and time considerations.

Accordingly, the phrase “hardware engine” should be understood toencompass a tangible entity, be that an entity that is physicallyconstructed, permanently configured (e.g., hardwired), or temporarilyconfigured (e.g., programmed) to operate in a certain manner or toperform certain operations described herein. As used herein,“hardware-implemented engine” refers to a hardware engine. Consideringembodiments in which hardware engines are temporarily configured (e.g.,programmed), each of the hardware engines need not be configured orinstantiated at any one instance in time. For example, where a hardwareengine comprises a general-purpose processor configured by software tobecome a special-purpose processor, the general-purpose processor may beconfigured as respectively different special-purpose processors (e.g.,comprising different hardware engines) at different times. Softwareaccordingly configures a particular processor or processors, forexample, to constitute a particular hardware engine at one instance oftime and to constitute a different hardware engine at a differentinstance of time.

Hardware engines can provide information to, and receive informationfrom, other hardware engines. Accordingly, the described hardwareengines may be regarded as being communicatively coupled. Where multiplehardware engines exist contemporaneously, communications may be achievedthrough signal transmission (e.g., over appropriate circuits and buses)between or among two or more of the hardware engines. In embodiments inwhich multiple hardware engines are configured or instantiated atdifferent times, communications between such hardware engines may beachieved, for example, through the storage and retrieval of informationin memory structures to which the multiple hardware engines have access.For example, one hardware engine may perform an operation and store theoutput of that operation in a memory device to which it iscommunicatively coupled. A further hardware engine may then, at a latertime, access the memory device to retrieve and process the storedoutput. Hardware engines may also initiate communications with input oroutput devices, and can operate on a resource (e.g., a collection ofinformation).

The various operations of example methods described herein may beperformed, at least partially, by one or more processors that aretemporarily configured (e.g., by software) or permanently configured toperform the relevant operations. Whether temporarily or permanentlyconfigured, such processors may constitute processor-implemented enginesthat operate to perform one or more operations or functions describedherein. As used herein, “processor-implemented engine” refers to ahardware engine implemented using one or more processors.

Similarly, the methods described herein may be at least partiallyprocessor-implemented, with a particular processor or processors beingan example of hardware. For example, at least some of the operations ofa method may be performed by one or more processors orprocessor-implemented engines. Moreover, the one or more processors mayalso operate to support performance of the relevant operations in a“cloud computing” environment or as a “software as a service” (SaaS).For example, at least some of the operations may be performed by a groupof computers (as examples of machines including processors), with theseoperations being accessible via a network (e.g., the Internet) and viaone or more appropriate interfaces (e.g., an Application ProgramInterface (API)).

The performance of certain of the operations may be distributed amongthe processors, not only residing within a single machine, but deployedacross a number of machines. In some example embodiments, the processorsor processor-implemented engines may be located in a single geographiclocation (e.g., within a home environment, an office environment, or aserver farm). In other example embodiments, the processors orprocessor-implemented engines may be distributed across a number ofgeographic locations.

Language

Throughout this specification, plural instances may implementcomponents, operations, or structures described as a single instance.Although individual operations of one or more methods are illustratedand described as separate operations, one or more of the individualoperations may be performed concurrently, and nothing requires that theoperations be performed in the order illustrated. Structures andfunctionality presented as separate components in example configurationsmay be implemented as a combined structure or component. Similarly,structures and functionality presented as a single component may beimplemented as separate components. These and other variations,modifications, additions, and improvements fall within the scope of thesubject matter herein.

Although an overview of the subject matter has been described withreference to specific example embodiments, various modifications andchanges may be made to these embodiments without departing from thebroader scope of embodiments of the present disclosure. Such embodimentsof the subject matter may be referred to herein, individually orcollectively, by the term “invention” merely for convenience and withoutintending to voluntarily limit the scope of this application to anysingle disclosure or concept if more than one is, in fact, disclosed.

The embodiments illustrated herein are described in sufficient detail toenable those skilled in the art to practice the teachings disclosed.Other embodiments may be used and derived therefrom, such thatstructural and logical substitutions and changes may be made withoutdeparting from the scope of this disclosure. The Detailed Description,therefore, is not to be taken in a limiting sense, and the scope ofvarious embodiments is defined only by the appended claims, along withthe full range of equivalents to which such claims are entitled.

It will be appreciated that an “engine,” “system,” “data store,” and/or“database” may comprise software, hardware, firmware, and/or circuitry.In one example, one or more software programs comprising instructionscapable of being executable by a processor may perform one or more ofthe functions of the engines, data stores, databases, or systemsdescribed herein. In another example, circuitry may perform the same orsimilar functions. Alternative embodiments may comprise more, less, orfunctionally equivalent engines, systems, data stores, or databases, andstill be within the scope of present embodiments. For example, thefunctionality of the various systems, engines, data stores, and/ordatabases may be combined or divided differently.

“Open source” software is defined herein to be source code that allowsdistribution as source code as well as compiled form, with awell-publicized and indexed means of obtaining the source, optionallywith a license that allows modifications and derived works.

The data stores described herein may be any suitable structure (e.g., anactive database, a relational database, a self-referential database, atable, a matrix, an array, a flat file, a documented-oriented storagesystem, a non-relational No-SQL system, and the like), and may becloud-based or otherwise.

As used herein, the term “or” may be construed in either an inclusive orexclusive sense. Moreover, plural instances may be provided forresources, operations, or structures described herein as a singleinstance. Additionally, boundaries between various resources,operations, engines, and data stores are somewhat arbitrary, andparticular operations are illustrated in a context of specificillustrative configurations. Other allocations of functionality areenvisioned and may fall within a scope of various embodiments of thepresent disclosure. In general, structures and functionality presentedas separate resources in the example configurations may be implementedas a combined structure or resource. Similarly, structures andfunctionality presented as a single resource may be implemented asseparate resources. These and other variations, modifications,additions, and improvements fall within a scope of embodiments of thepresent disclosure as represented by the appended claims. Thespecification and drawings are, accordingly, to be regarded in anillustrative rather than a restrictive sense.

Conditional language, such as, among others, “can,” “could,” “might,” or“may,” unless specifically stated otherwise, or otherwise understoodwithin the context as used, is generally intended to convey that certainembodiments include, while other embodiments do not include, certainfeatures, elements and/or steps. Thus, such conditional language is notgenerally intended to imply that features, elements and/or steps are inany way required for one or more embodiments or that one or moreembodiments necessarily include logic for deciding, with or without userinput or prompting, whether these features, elements and/or steps areincluded or are to be performed in any particular embodiment.

Although the invention has been described in detail for the purpose ofillustration based on what is currently considered to be the mostpractical and preferred implementations, it is to be understood thatsuch detail is solely for that purpose and that the invention is notlimited to the disclosed implementations, but, on the contrary, isintended to cover modifications and equivalent arrangements that arewithin the spirit and scope of the appended claims. For example, it isto be understood that the present invention contemplates that, to theextent possible, one or more features of any embodiment can be combinedwith one or more features of any other embodiment.

The invention claimed is:
 1. A method for responding to theft of asensor enclosure associated with a vehicle, the method comprising:cooling the sensor enclosure using a fan disposed at a base of thesensor enclosure; receiving light at one or more sensors encased by thesensor enclosure through a transparent cover of the sensor enclosure;detecting the theft of the sensor enclosure using at least onepiezoelectric sensor, wherein the at least one piezoelectric sensor isdisposed beneath the sensor enclosure and between the sensor enclosureand a fixture of the vehicle on which the sensor enclosure is mounted;and generating an electric signal to the at least one piezoelectricsensor, wherein the electric signal causes the at least onepiezoelectric sensor to emit a sound.
 2. The method of claim 1, whereinthe at least one piezoelectric sensor comprises a piezoelectric diskadhered to a diaphragm, and wherein the piezoelectric disk comprises oneof a crystal material or a ceramic material and the diaphragm comprisesmetallic alloy.
 3. The method claim of 2, wherein the crystal materialcomprises at least one of quartz, langasite, gallium orthophosphate,lithium niobate, or lithium tantalate.
 4. The method claim of 2, whereinthe ceramic material comprises at least one of barium titanate, leadzirconate titanate, potassium niobate, sodium tungstate, zinc oxide,sodium potassium niobate, bismuth ferrite, sodium niobate, bariumtitanate, bismuth titanate, or sodium bismuth titanate.
 5. The methodclaim of 2, wherein the metallic alloy comprises at least one of brassor nickel alloy.
 6. The method of claim 1, further comprising:amplifying the sound emitted from the at least one piezoelectric sensorbased on resonance.
 7. The method of claim 6, wherein amplifying thesound emitted from the at least one piezoelectric sensor based onresonance comprises: tuning a frequency of the sound to be near aresonant frequency associated with the at least one piezoelectric sensorby varying a size of the diaphragm or varying a frequency the electricsignal changes its polarity.
 8. The method of claim 7, wherein theelectric signal is an alternating voltage signal.
 9. The method of claim8, wherein the alternating voltage signal causes the piezoelectric diskto elongate or contract in response, wherein the elongation or thecontraction of the piezoelectric disk causes the diaphragm to move in aback and forth motion causing sound waves audible as the sound.
 10. Themethod of claim 1, further comprising: amplifying the sound emitted fromthe at least one piezoelectric sensor by coupling the at least onepiezoelectric sensor to an acoustic cone.
 11. A system for responding totheft of a sensor enclosure of a vehicle comprising: the sensorenclosure mounted on a fixture of the vehicle, the sensor enclosurecomprising: a fan disposed at a base of the sensor enclosure, one ormore sensors encased by the sensor enclosure, and a cover as an exteriorof the enclosure, the cover transparent to lights receptive to the oneor more sensors; at least one piezoelectric disposed beneath the sensorenclosure and in between the sensor enclosure and the fixture; and oneor more processors to perform: detecting the theft of the sensorenclosure using the at least one piezoelectric sensor; and generating anelectric signal to the at least one piezoelectric sensor, wherein theelectric signal causes the at least one piezoelectric sensor to emit asound.
 12. The system of claim 11, wherein the at least onepiezoelectric sensor comprises a piezoelectric disk adhered to adiaphragm, and wherein the piezoelectric disk comprises one of a crystalmaterial or a ceramic material and the diaphragm comprises metallicalloy.
 13. The system of claim 12, wherein the crystal materialcomprises at least one of quartz, langasite, gallium orthophosphate,lithium niobate, or lithium tantalate.
 14. The system of claim 12,wherein the ceramic material comprises at least one of barium titanate,lead zirconate titanate, potassium niobate, sodium tungstate, zincoxide, sodium potassium niobate, bismuth ferrite, sodium niobate, bariumtitanate, bismuth titanate, or sodium bismuth titanate.
 15. The systemof claim 12, wherein the metallic alloy comprises at least one of brassor nickel alloy.
 16. The system of claim 11, wherein the one or moreprocessors further perform: amplifying the sound emitted from the atleast one piezoelectric sensor based on resonance.
 17. The system ofclaim 16, wherein amplifying the sound emitted from the at least onepiezoelectric sensor based on resonance comprises: tuning a frequency ofthe sound to be near a resonant frequency associated with the at leastone piezoelectric sensor by varying a size of the diaphragm or varying afrequency the electric signal changes its polarity.
 18. The system ofclaim 17, wherein the electric signal is an alternating voltage signal.19. The system of claim 18, wherein the alternating voltage signalcauses the piezoelectric disk to elongate or contract in response,wherein the elongation or the contraction of the piezoelectric diskcauses the diaphragm to move in a back and forth motion causing soundwaves audible as the sound.
 20. The system of claim 11, wherein the oneor more processors further perform: amplifying the sound emitted fromthe at least one piezoelectric sensor by coupling the at least onepiezoelectric sensor to an acoustic cone.